Chuck



W. L. McLEAN.

CHUCK.

APPLICATION FILEDSEPT. 29, 1921.

1,431,533, Patented Oct. 10, 1922.

Win55; Z

1ilatenteil ct. l0, 1922.

UNITED STATES WARREN L. MGLEAN, OF SAN FRANCISCO, CALIFORNIA.

CHUCK.

Application nled September 29, 1921. Serial No. 504,011.

To al( whom t may concern:

Be it known that I, VARREN L. MoLEAN, a citizen of the Dominion ofCanada, and resident of San Francisco, county of San Francisco, andState of California, have invented a new and useful Chuck, of which thefollowing is al Specification.

The present invention relates to improvements in Vchucks and hasreference more particularly to such chucks as are used in connectionwith screw drivers, drills and similar rotating tools. The inventionhereinafter described. constitutes an improvement on thedevice disclosedin my co-pending application Serial No. 383,617, filed May 24.-, 1929,entitled Screw driver. j

The present improvement was designed with particular reference to thescrew driver disclosed in said application, but the general principleinvolvedca'n be used as well in connection with drills or lsimilar toolsin ,which `a rotating bit is to be gripped by the tool actuating thesame.. The principal object of the present invention is to provide a.chuck that is provided with jaws adapted to adjust themselves or theirbit engaging surfaces to the particular shape of the bit to be engaged.l y

A further object of my inventionv is to provide my chuck with simpleauxiliary means for rotating the same in case the means ordinarilyprovided for this purpose do not allow of the application of suihcientstrength to rotate the bit. The preferred form of my invention isillustrated in the accompanying drawing, in which Figure l represents aside view of my chuck, portions-of the same being broken away to disclose the interior; Figure 2 a horizontal cross section along line 2-2of Figure 1; Figure 3 a vertical cross section along line wl of Figure2; Figure 4t a horizontal cross section along line /i-*t of Figure 3;Figure i a vertical cross section corresponding to that shown in Figure3 but representing the jaws in a somewhat different position; Figure 6 awrenchto be used in connection with the chuck; Figure 7 a vertical crosssection through the vtool substantially along line 2 2 of Figure lillustrating the use of the wrench referred to; Figure 8 a perspectiveview of the jaws used in my chuck, and Figure 9 a perspective view of asleeve adapted to be used in combination with thek wrench illustrated inFigure 6.

Referring to the drawings in detail, it will be seen that only the chuckportion of the tool, which may be a screw-driver, or a drill or somesimilar device, is shown in the drawing. For the sake of convenience itmay be assumed that the tool portion (l) shown in Figure l is the lowerend of the screw-driver illustrated in my co-pending application, or ofany other screw driver of a type commonly known as the Yankee screwdriver. The chuck (2) comprises the two jaws (3), a jaw retainingportion (4f) anda sleeve (6).

The two jaws (3) are ythe principal part of my invention and theirparticular feature is the means for joining the same,

which consists in a spring (7) comprising a string of wire turned into acentral loop and having its two ends turned side ways in oppositedirections as shown in Figures 3 and 5, each end being adapted to bereceived in a corresponding perforation (l0) in the top end of eachjaw.V The tendency of this spring is to normally `hold the two jaws inspaced relation to each other in the manner illustrated in Figure 5,which shows the top ends of the two jaws in rather close vrelation whilethe bottom ends are further away from each other so that normally theinterior surfaces of the jaws do not run parallel to each other butslant away from each other downwardly. The particular spring connectionbetween the two aws, however, allows the relative position of the sameto be adjusted so that they may change their slanting position to aparallel position in the following manner:

Assuming that the bit (9) indicated in dotted lines in Figure 5 iscarried upwardly between the jaws until it comes in contact with theirinterior surfaces, it will be seen that upon pressing the jaws togetherby means of the sleeve (6) the jaws will pivot on the points of contactbetween the jaws and the bit and will assume such a position that theirinterior surfaces lie substantially flat against the surface of the bit,thus es tablishing a iirm holding contact along the whole line ofengagement ln this manner any shape of bit within reasonable limits canbe introduced between the jaws and they CTX `torce the latter together.

v handle actuating the same.

tion (l2) of somewhat smaller dimensions, and an interior Oroove (la)increasing in dimensions toward the bottom. and provided at the bottomwith a shoulder (16) adapted to engage a corresponding shoulder (17)provided in the commonly used 1 u oit (lb), and holding the same againstlongitudinal displacement.

` The jaw retaining portion is provided at the top with a recess (2l) orsquare cross section adapted `to receive the barl torni'- ing a part ofthe tool handle. Through the main portion of the jaw retainer extends acircular recess (23) beginning at the bottom and extending upwardlyandadapted to receive the spring (7) previously referred to. To receivelthe upper portions ol the jaws a cent-ral part (26) of the retainer iscut away altogether, which allows the jaws tol spread under theinfluence ot the spring Where the cutfaway portion begins acurvedshoulder (27) is provided which allows the` jaws to spread theiradja- Cent upper ends in the manner hereinbeiore described. Exteriorlythe lower portion oit Athe jaw retainer is threaded and adapted "togrooves (31) and is yheld in that position bythe rspring which extendsaround the retainer and holds the hoolrin contactvwith the same.`

p Itwill be seen that in this manner the hook can be easily slipped on4the retainer whenever it becomesnecessary to exert more force inrotating the drill than can ordinarily be obtained from the Thisparticular wrench (32)l in combination with a groo-ved sleeve (37) canbe used generally :tor vthe j turning of nuts in inaccessible places, ifthe sleeve is provided with a perforation (38) of square or hexagonalcross section adapted to lit on the nut it is desired to turn.

lVhile I have` thus illustrated andl described a particular preferredform of my invention, I wish to remark that a number of changes andmodifications may be made, espepially as to the particular form of thejaws and the means for l clamping the jaws together, without .affectingthe spirit yof my invention, the essential feature of which is theparticular con necting means ot` the jaws allowing the latter to adjusttheir` relative position to each other and to a bit gripped by the sameso as to present contacts over an extended area ofthe respectivesurfaces irrespective oi the particular shape of the bit employed.

l. claim:`

l. In adevice of the character described,-

the coinbinationoi'` a chuck having a rplua wrpnch tor rotating thesamecomprising a hook adapted to engage any` one of the Vgrooves andyieldingr means for holding the hook in the groove allowing of lateralen-L gagement and disengagement. l

2. In a wrench the coinbfnation of a sleeve having a plurality ofexternal longitudinal grooves with a hook adapted t'o engage any oneofthe grooves and provided withy a spring adapted to hold it in the'sleeveand to allow ol lateral engagement and disengagement.

ln a y sleeve having a plurality of external longitudinal grooves with ahook comprising a handle ending in a curved portionadapted j to lieagainst a peripheral portion of the sleeve` and terminating j in latooth adapted to engage one ot the grooves, a spring being secured. tosaid curved portion and extendv'i'ench, the combination `of a Arality oflongitudinal'grooves therein and ing beyond the ltooth .aroundv thesleeve ,so

as to hold the hook in yielding contact with the sleeve. .y

vminanlir` L; MenEAN;

